Tool holder



G. OSBERG;

f -To oL HOLDER. APPLICATION FILED DEC-9, |919.

1,407,764-. Patented Feb. 2s, 1922 lul/l l FIT nvenTor. Gusaf Osbergf`- us 25 22 w/Mam' Ays.

have a'yielding inoveinent 'and when adjusted in this way the resiliency of the springsv 16, 17, 18 normally holds'thetool-holding member slightly separated from the body. v These springs are preferably of suri'oient4 strength to maintain the tool-holding mem-v ber in its forward position shown F ig. l during the operation of the tool on the work, but if for any reason' the tool'should catch in the work or meet an abnormal resistance,

thesprings will'yield to allow the toolhold Ving. member to give thereby preventing the tool from .becoming broken If desired, I may use springs of dilferent tension or strength Yin thel .different recesses. These springslcan be readily removed by first removing, entirely the clamping screwl 22' and then swinging the tool-holding member `outwardly, and .it isV possible, therefore, Vto use one 'o rmore ofthe springs depending upon the. strength of the yielding support which itis desirable to give tothe tool-holding member. f V

It -i-t is' desired to have a rigidlysupported tool,then the clampingscrew `22'will be ad-` justed so as :to clamp the face l5 ofthetoolhol-dingl meinberiirmly againstthe face 4f of 25"and recess 26 serve to lprevent any lateral movement of the tool-holding member rela-ly tive to the body.

if. wiii be noted that itesm-'5 i@ which the too-lfholdingm member pivotedlextends forwardlyl so that said Vmember is suspended,

from" the arm.' By this construction the pivotal` point of the toolholding member is situated in frontof the rear face thereof and above the tool. VI find that v,this is van ad# vantageous arrangement.

I have above referred to thex'ed clamping shoulder 8 and the adjustable clamping shoulder9 between which the tool 10 is clamped. I willpreferably make the tool-v holding member with a fixed shoulder 30 in the rear of the'shoulder 9 and against which the, tool rests, so that when the toolj is in use,

the strain of the tool will be partly taken byv the fixed shoulder 30 ,and partly by the clamping block 11. i v While I have illustrated a selected'embodimentof my invention, I donot wish to be limited to the constructional features shown."

ilclaim: Y Y i 1.7` In a tool holder, the combination with a body portion having a shank to be sustained in the tool post, of a tool-holding member pivoted', to said body portion, a

`spring interposed between said tool-holding member and body portion and providing a yielding backing for said member, and. ad-

justable means for limitingA the spring-impelled movement of said member, said means being `'capable of adjustment to maintain said member rigid with the body.

2. In a tool holdeigthe combination with a body portion having a shank to be sustained iii a tool post,`o;t a tool-holding member pivoted at its fu'pperend to thebody por# tion, aspring interposed between said toolholding member and body portiomand an adjusting screw/extending through one of:

said parts andk screwing into the other, said screw beingcapable of adjustment so as to allow the tool-holding member to have -a yielding movementv relativev to the body or so as to clamp said member firmly against the body." l`

3. In'f a tool holder, thel combination with a body portionhaving a shank to be sustained ina tool post and a forwardly-extend-V ing .armat its upper end, of a tool-holding member pivoted tosaid arm and provided with spring-receiving recess in its rear face, a spring `in said. recess which tends normallyl to 'swing vsaid member away from the body` portion, and an adjusting screw extending through said member at its lower end and screw threading into the body portion, said` screw beingcapable of adjustment so'as to allow the'tool-holding member to have 4a yielding movement relative tothe body or so as'to clamp said member iirmly against the body.. y

, 4. In a tool holder, the combination with a body portion having. a shank to be sustainedfin a tool post and a forwardly-ex tending arm at its upper end, of a tool-holding memberupivoted to saidarm and provided with a. spring-receiving recess `in its rear race', a ,springv in said recess which tends normally to Iswing said member'away from the body portion, an adjusting screw 'exe tending through said member at its lower end and screw threading into the body por tioi'i, said vbody portion 'having a guidingr projection andthe tool-.holding member having a recess to receive said projection.

,In testimony whereof, I have signed my name l.to `this specification.

GUSTAF osBERG.

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